18993065387 has 2 divisors, whose sum is σ = 18993065388. Its totient is φ = 18993065386.

The previous prime is 18993065383. The next prime is 18993065401. The reversal of 18993065387 is 78356039981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18993065387 - 2² = 18993065383 is a prime.

It is not a weakly prime, because it can be changed into another prime (18993065383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9496532693 + 9496532694.

It is an arithmetic number, because the mean of its divisors is an integer number (9496532694).

Almost surely, 2^18993065387 is an apocalyptic number.

18993065387 is a deficient number, since it is larger than the sum of its proper divisors (1).

18993065387 is an equidigital number, since it uses as much as digits as its factorization.

18993065387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 18993065387 in words is "eighteen billion, nine hundred ninety-three million, sixty-five thousand, three hundred eighty-seven".